Etymologies

Latin tāctus, touch; see tact + -al1.

(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

In the lowest organisms we have a kind of tactual sense diffused over the entire body; then, through impressions from without and their corresponding adjustments, special portions of the surface become more responsive to stimuli than others.

Indeed, her presence gave the house what none other of the houses that he visited seemed to possess: a sort of tactual sense, a nervous system which ramified into each of its rooms and sent a constant stimulus to his heart.